if it kills you

if it kills (one)

By any means necessary; no matter the cost or difficulties involved for one. I've come too far to give up now—I'm going to get this washing machine working again if it kills me! He's determined to get the decision overturned, even if it kills him.
See also: if, kill
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

if it kills you

whatever the problems or difficulties involved. informal
2001 Nancy Hope Wilson Mountain Pose I'm cracking that code if it kills me.
See also: if, kill
Farlex Partner Idioms Dictionary © Farlex 2017
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